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采用SEM和AFM技术研究了锈蚀转化涂层形貌的演化过程,利用XPS技术研究了锈蚀转化剂对Fe3+的转化能力,通过能谱分析和红外光谱技术,研究了锈蚀转化剂中的关键组分,从而推断出锈蚀转化剂的反应机理。结果表明,当锈蚀转化剂涂覆在锈蚀层上,其表面发生了一些化学反应。在72 h后,锈蚀转化涂层由两相融为均匀相,并且表面粗糙度降低。在此过程中,锈蚀层中Fe3+部分转化为Fe2+。生成的Fe2+和剩余的Fe3+则与锈蚀转化剂中的无机阴离子和单宁酸形成稳定的Fe PO4,Fe3(PO4)2,Zn3(PO4)2和单宁酸铁络合物构成的保护膜。
The evolution process of corrosion conversion coating morphology was studied by SEM and AFM. The conversion ability of rust conversion agent to Fe3 + was studied by XPS. The key components of corrosion conversion agent were studied by energy spectrum analysis and infrared spectroscopy. , In order to deduce the reaction mechanism of rust conversion agent. The results show that when the rust converter is coated on the corrosion layer, some chemical reactions occur on the surface. After 72 h, the corrosive conversion coating melted from two phases into a homogeneous phase and the surface roughness decreased. During this process, the Fe3 + portion of the corrosion layer is converted to Fe2 +. The formed Fe2 + and the remaining Fe3 + form a protective film with stable FePO4, Fe3 (PO4) 2, Zn3 (PO4) 2 and iron tannate complex with inorganic anion and tannic acid in the rusting conversion agent.